US6471713B1 - System for deploying an anastomosis device and method of performing anastomosis - Google Patents
System for deploying an anastomosis device and method of performing anastomosis Download PDFInfo
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- US6471713B1 US6471713B1 US09/709,373 US70937300A US6471713B1 US 6471713 B1 US6471713 B1 US 6471713B1 US 70937300 A US70937300 A US 70937300A US 6471713 B1 US6471713 B1 US 6471713B1
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- anastomosis device
- trocar
- deployment
- anastomosis
- vessel
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/11—Surgical instruments, devices or methods, e.g. tourniquets for performing anastomosis; Buttons for anastomosis
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320016—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00367—Details of actuation of instruments, e.g. relations between pushing buttons, or the like, and activation of the tool, working tip, or the like
- A61B2017/00371—Multiple actuation, e.g. pushing of two buttons, or two working tips becoming operational
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/11—Surgical instruments, devices or methods, e.g. tourniquets for performing anastomosis; Buttons for anastomosis
- A61B2017/1107—Surgical instruments, devices or methods, e.g. tourniquets for performing anastomosis; Buttons for anastomosis for blood vessels
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/11—Surgical instruments, devices or methods, e.g. tourniquets for performing anastomosis; Buttons for anastomosis
- A61B2017/1135—End-to-side connections, e.g. T- or Y-connections
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
- A61F2/06—Blood vessels
- A61F2/064—Blood vessels with special features to facilitate anastomotic coupling
Definitions
- the invention relates to a system for deployment of an anastomosis device and a method of performing anastomosis.
- the system can be used for piercing a vessel wall as an initial step in forming a sutureless connection between a bypass graft and a blood vessel, and the subsequent deployment of an anastomosis device.
- Vascular anastomosis is a procedure by which two blood vessels within a patient are surgically joined together. Vascular anastomosis is performed during treatment of a variety of conditions including coronary artery disease, diseases of the great and peripheral vessels, organ transplantation, and trauma.
- coronary artery disease CAD
- an occlusion or stenosis in a coronary artery interferes with blood flow to the heart muscle.
- Treatment of CAD involves the grafting of a vessel in the form of a prosthesis or harvested artery or vein to reroute blood flow around the occlusion and restore adequate blood flow to the heart muscle. This treatment is known as coronary artery bypass grafting (CABG).
- CABG coronary artery bypass grafting
- thrombi and atherosclerotic lesions are formed at and around the grafted artery, which can result in the reoccurrence of ischemia.
- the thrombi and atherosclerotic lesions may be caused by the configuration of the sutured anastomosis site. For example, an abrupt edge at the anastomosis site may cause more stenosis than a more gradual transition.
- sutureless vascular anastomosis device which easily connects a graft to a target vessel and can be deployed in limited space. It would also be desirable to provide a sutureless anastomosis device which is formed of one piece and is secured to the target vessel by a one piece tool which can perform both the initial piercing of the tissue and deployment of the anastomosis device.
- the present invention relates to a deployment system for forming an incision in a wall of a target vessel and delivering an anastomosis device for connecting an end of a graft vessel to a target vessel at the site of the incision.
- the deployment system preferably includes a trocar, a tissue punch having a piercing element at a distal end thereof for being advanced through the trocar to form a puncture and for thereafter being withdrawn from the trocar, a holder tube slidably disposed within the trocar, an expander tube for cooperating with the holder tube, and a rotatable control, whereby rotation of the control causes advancing and withdrawal of the tissue punch and relative slidable movement between the trocar, the holder tube, and the expander tube for deployment of the anastomosis device.
- the trocar is a tubular member having a passage therein through which the anastomosis device is deliverable to the incision site.
- the piercing element comprises a cutting blade which is movable with respect to the trocar such that the cutting blade can be moved from a cutting position at which the cutting blade is exposed to a retracted position at which the cutting blade is not exposed.
- the preferred embodiment is directed to an anastomosis device deployment system including a deployment tool having a rotatable control knob, a holder tube attached to the tool, the holder tube having a distal end configured to hold the anastomosis device with an attached graft vessel, and an expander positioned within the holder and slidable with respect to the holder to a position at which the expander is positioned within the anastomosis device and radially expands the anastomosis device.
- the system further preferably includes a trocar movable with respect to the holder tube to form an opening in a target vessel to receive the anastomosis device and attached graft vessel.
- the deployment tool includes three cam grooves, and the trocar, holder tube and expander each have a follower member engaged in one of the cam grooves to move the trocar, holder tube and expander with respect to one another upon rotation of the control knob.
- a method of performing anastomosis includes providing a deployment tool having a trocar, an expander tube, a holder tube holding a one-piece tubular anastomosis device having an end of a graft vessel everted around the anastomosis device, and a rotatable control knob for moving the trocar, the expander tube and the holder tube relative to one another.
- the method includes rotating the control knob to puncture a target vessel with the trocar, rotating the control knob to insert the tubular anastomosis device with everted graft vessel into the puncture in the target vessel, rotating the control knob to radial expand the tubular anastomosis device with the expander tube to cause a portion of the anastomosis device to fold outward forming a first annular flange, and rotating the control knob to form a second annular flange on the anastomosis device to trap a wall of the target vessel between the first and second annular flanges and seal the graft vessel to the target vessel.
- enlargement of an internal diameter of the anastomosis device with the expander tube causes the formation of the first flange.
- the device is expanded by an expander in the form of an inflatable balloon.
- the radial expansion of the anastomosis device causes a portion of the device to bend at a plurality of hinges to form the first and second annular flanges.
- the deployment tool may further comprise a tissue punch, wherein rotation of the control knob causes advancement of the tissue punch into the target vessel prior to advancement of the trocar.
- the target vessel is an aorta and the method is performed without occlusion (i.e., clamping) of the aorta.
- the end of the graft vessel and the edges of the incision in the target vessel can be captured between the first portion and the second portion so that the end of the graft vessel abuts an outside wall of the target vessel.
- the anastomosis device can be expandable from a first configuration to a larger second configuration where the anastomosis device is expanded with an expander to cause a portion of the anastomosis device to fold outward forming the first flange.
- the first flange holds a portion of the graft vessel in contact with an inner surface of the target vessel.
- FIG. 1 is perspective views of a typical embodiment of an anastomosis device in a planar configuration
- FIG. 2 is a perspective view of the anastomosis device of FIG. 1 in a configuration attached to the deployment tool of the present invention, prior to deployment;
- FIG. 3A is a perspective views of an anastomosis device deployment tool in accordance with the present invention.
- FIG. 3B is a side elevational view thereof
- FIG. 4A is a sectional perspective view of a further embodiment of an anastomosis device deployment tool in accordance with the present invention.
- FIG. 4B is a side elevational view thereof
- FIG. 5 is a side cross sectional view of a loaded tissue punch device for use in the anastomosis device deployment tool shown in FIG. 3;
- FIG. 5A is an enlarged view thereof
- FIG. 6 is a side cross sectional view of the tissue punch device loaded into the anastomosis device deployment tool shown in FIG. 3;
- FIG. 6A is an enlarged view thereof
- FIG. 7 is a side cross sectional view of the anastomosis device deployment tool with the piercing element puncturing the target vessel;
- FIG. 7A is an enlarged view thereof
- FIG. 8 is a side cross sectional view of the anastomosis device deployment tool with the trocar moved forward for cutting an opening in the vessel wall;
- FIG. 8A is an enlarged view thereof
- FIG. 9 is a side cross-sectional view of the deployment tool when the tissue punch spring has fired.
- FIG. 9A is an enlarged view thereof
- FIG. 10 is a side cross-sectional view of the deployment tool as the tissue punch is being withdrawn through the opening in the side of the trocar;
- FIG. 10A is an enlarged view thereof
- FIG. 11 is a side cross-sectional view of the deployment tool with the tissue punch device pivoted entirely out of the trocar;
- FIG. 11A is an enlarged view thereof
- FIG. 12 is a side cross-sectional view of the deployment tool with the holder tube and expander tube moved forward for the deployment of the anastomosis device;
- FIG. 12A is an enlarged view thereof
- FIG. 13 is a side cross-sectional view of the deployment tool with the holder tube and expander tube advanced to begin deployment of the inner flange of the anastomosis device and the trocar beginning to be withdrawn;
- FIG. 13A is an enlarged view thereof
- FIG. 14 is a side cross sectional view of the deployment tool with the expander tube advanced to complete deployment of the inner flange of the anastomosis device and the trocar further withdrawn;
- FIG. 14A is an enlarged view thereof
- FIG. 15 is a side cross sectional view of the deployment tool with the trocar withdrawn and the expander withdrawn so as to seat the inner flange of the anastomosis device;
- FIG. 15A is an enlarged view thereof
- FIG. 16 is a side cross sectional view of the deployment tool with the holder tube advanced for deployment of the outer flange of the anastomosis device and disengagement of the anastomosis device therefrom;
- FIG. 16A is an enlarged view thereof
- FIG. 17 is a side cross sectional view of the deployment tool with the trocar, expander tube and holder tube withdrawn for tool removal from the target vessel;
- FIG. 17A is an enlarged view thereof.
- target vessel is thus used to refer to vessels within the patient which are connected to either or both of the upstream and downstream end of the graft vessel.
- a large vessel anastomotic device is used with large diameter target vessels such as the aorta or its major side branches.
- the device In deploying a large vessel anastomotic device, the device (with one end of a graft vessel attached thereto) is inserted into an incision in a wall of the target vessel with a deformable section in a first configuration, and the deformable section is radially expanded to a second configuration to deploy a flange.
- the flange applies an axial force against the wall of the target vessel.
- the flange can be configured to apply a radial force, substantially transverse to the device longitudinal axis, against the wall of the target vessel, to secure the device to the target vessel.
- the device can have a plurality of deformable sections forming distal and proximal flanges. With the proximal and distal end flanges deployed, the device can be prevented from shifting proximally out of the target vessel or distally further into the interior of the target vessel.
- a device can be used to connect the proximal end of the graft vessel to the aorta.
- the surgeon may wish to avoid this region and connect the proximal end of the graft vessel to any other adjacent less diseased vessel, such as the arteries leading to the arms or head.
- the devices can be used with venous grafts, such as a harvested saphenous vein graft, arterial grafts, such as a radial artery, or a synthetic prosthesis, as required.
- anastomotic device does not require the stoppage of blood flow in the target vessel.
- anastomotic devices can be connected to the target vessel without the use of cardiopulmonary bypass, thereby avoiding many of the risks of conventional heart surgery.
- anastomosis techniques wherein the aorta is clamped to interrupt blood flow to the area of the aortic wall to which a vein is to be anastomosed may result in liberation of plaques and tissue fragments which can lead to organ dysfunction, such as strokes, renal failure, or intestinal ischemia.
- severely diseased aortas may not provide an area suitable for clamping due to significant calcification of the aortic wall.
- a sutureless connection can be provided between a graft and a target vessel, while minimizing thrombosis or restenosis associated with the anastomosis.
- the anastomotic devices can be attached to the target vessel inside a patient remotely from outside the patient using specially designed applicators, so that the devices are particularly suitable for use in minimally invasive surgical procedures where access to the anastomosis site is limited.
- the devices allow the anastomosis to be performed very rapidly, with high reproducibility and reliability, without clamping, and with or without the use of cardiopulmonary bypass.
- the surgeon operates a deployment tool using both hands.
- One hand supports the tool via a handle while the other twists an actuation knob or other control member to deploy the anastomotic device.
- Locating the actuation knob on the tool's main axis minimizes the tendency of reaction forces to wobble the tool keeping it stable and in proper position during deployment.
- the twisting motion is converted to linear displacements by a set of rotating cams that engage a trocar, holder, and expander. The cams control the sequence of relative motions between the instrument's trocar and device deployment mechanisms.
- a surgeon will place the tip of the instrument (the mechanical stop) in light contact with the site on the aorta to be anastomosed. Having located a suitable site, the surgeon then twists the actuation knob to fire the spring-loaded tissue punch and continues twisting to continue deployment of the anastomotic device.
- the trocar penetrates the aortic wall and maintains a substantially fluid-tight seal at the puncture site. Having entered the aortic lumen, the trocar forms a passageway for the anastomotic device and its holder tube (crown) to be advanced, thus retracting the aortic tissue and serving as an introducer for the device.
- the trocar begins to be withdrawn, while the anastomotic device is then expanded to its full diameter and an inner flange is deployed.
- the device is then drawn outwards towards the instrument where a mechanical stop is encounters, and where the inner flange is firmly seated against the intimal wall of the aorta.
- An outer flange is then deployed from the external side, compressing the aortic wall between the inner and outer flanges, and finally, the device is disengaged from the instrument completing the anastomosis.
- FIGS. 1 and 2 illustrate an exemplary anastomosis device 600 (illustrated in planar form in FIG. 1 for ease of description but which would be used in a tubular shape as shown in FIG. 2) which cooperates with a deployment tool 150 (described below) for delivering and deploying an implant 604 at a site in a living body.
- the anastomosis device 600 includes a frangible linkage 602 connecting the implant 604 to a discard portion 606 .
- the implant 604 can be expanded to deploy an inner flange and subsequently axially compressed to deploy an outer flange while severing the implant 604 from the discard portion 606 .
- the deployment tool can then be withdrawn along with the discard portion 606 which remains attached to the distal end of the deployment tool.
- the barbs 608 are pivoted outwardly by struts 610 such that the outwardly extending barbs 608 and struts 610 form the inner flange.
- the barbs 608 comprise points on the ends of axially extending members 612 which have narrow sections 614 located a desired distance from the free ends of the barbs 608 .
- the narrow sections 614 can be located at axial positions along the device corresponding approximately to a position slightly distal of the axial midpoint of the struts 610 connecting adjacent members 612 when the device is in the preexpanded condition.
- the distal ends of the struts can be curved at their points of attachment to the members 612 .
- a curved bend can be provided at the intersection where the proximal ends of the struts are attached together.
- the barbs 608 are locked into position by an X-shaped frame formed by struts 610 and additional struts 616 .
- the struts 616 are similar in configuration to the struts 610 with respect to how they are shaped and attached to the members 612 .
- Short axially extending members 618 connect the intersection of the struts 610 to the intersection of the struts 616 .
- the frangible section 602 is located at the proximal ends of axially extending members 620 which are connected to the members 612 by U-shaped links 622 .
- the members 620 are arranged as circumferentially spaced apart pairs which are attached together at midpoints of links 622 .
- the individual links 622 are plastically deformed from their U-shaped configuration to form segments of a circumferentially extending annular ring.
- the device becomes shorter in the axial direction as links 622 form the annular ring.
- the proximal ends of each pair of members 620 attached to an individual link 622 move radially outward and apart in the circumferential direction.
- the frangible section 602 is located between pairs of the axial members 620 and pairs of axially extending members 624 .
- the members 620 are substantially parallel to each other when the device is in its unexpanded condition, i.e., prior to formation of the inner flange. However, when the device is radially expanded the distal ends of the members 620 will remain closer together than their proximal ends since the distal ends are attached to a midpoint of the links 622 .
- the proximal ends of pairs of the members 624 are attached at mid-points of U-shaped links 626 by a pair of thin links 627 .
- the U-shaped links 626 deform into a circumferentially extending ring while proximal ends of pairs of the members 624 spread apart such that a gap 628 between the pairs of members 624 becomes wider at the proximal ends of the members 624 .
- the members 624 include a curved recess 629 at the distal ends thereof.
- the distal ends of members 624 are connected to the proximal ends of the members 620 by a frangible joint comprised of shearable connections 602 , the members 620 are connected at their proximal ends by a cross piece 630 and the members 624 are connected by a cross piece 635 which includes a projection 636 received in a recess 634 .
- the frangible joint is formed from a unitary piece of material such as a laser cut tube wherein the shearable connections 602 comprise thin sections of material extending between opposite sides of the projection 636 and opposing walls of the recess 634 .
- the device 600 can be deployed by using a deployment tool 150 , described in greater detail below.
- the device 600 includes a crown attached to a distal end of the deployment tool.
- the crown includes axially extending members 642 with tabs 643 on the proximal ends thereof, the members 642 being held in slots 151 of the tool 150 by the tabs 643 .
- a plastic sleeve (not shown) can be placed over the slots 151 to prevent the members 642 from coming out of the slots.
- the crown When mounted on the deployment tool with an everted graft vessel thereon (not shown), the crown is flared outwardly such that the members 642 are fully radially expanded at their proximal ends.
- the diamond shaped linkage of the crown 640 is expanded from an unexpanded condition like the configuration shown in FIG. 1 to an expanded condition having deployed inner and outer flanges.
- anastomosis device 600 is shown and described for utilization with the deployment system of the present invention, it should be clear to one skilled in the art that other embodiments of such anastomosis devices could of course also be used herewith, including but not limited to, those described for example in U.S. application Ser. Nos. 09/314,278 and 09/437,428, the entire contents of which are hereby incorporated by reference.
- FIGS. 3A and 3B illustrate the deployment system 150 of the present invention, and the sequential deployment of an anastomosis device 600 , including insertion of the anastomosis device past the aortic wall into the aortic lumen, deployment of an inner flange, seating the inner flange on the aortic intima, deployment of the outer flange, seating of the outer flange, and then fixing of the anastomosis device in place and detachment from the tool, is shown in FIGS. 51-7A.
- the deployment system 150 includes a hollow outer trocar 152 , a holder tube 154 (not shown in FIGS.
- the anastomosis device may be attached to the distal end of the holder tube by inserting members 642 of the device into slots 151 which are formed around the circumference of the holder tube, or by insert-molding, or by any other attachment means.
- the trocar 152 , holder tube 154 and expander tube 156 are all slidable with respect to one another during operation of the device.
- a control member or device handle 160 preferably a rotatable knob, is provided for moving the tubes with respect to one another through sequential movement of the cams 178 , 180 , 182 , 183 as discussed further below.
- the device also includes cam connectors 188 which preferably fasten together two halves (shown as a unitary body) which define the cam body 189 .
- the movement of the cams can be caused by mechanical, manual, or pneumatic actuation, as well as any other type of known means for obtaining relative movement.
- the operation thereof to deploy the anastomosis device 600 according to the present invention is sequentially shown in FIGS. 5-17.
- FIGS. 5-5A illustrate a tissue punch 100 in accordance with the present invention, and as more fully described in U.S. application Ser. No. 09/542,976, the entire contents of which is hereby incorporated by reference.
- the tissue punch 100 is loaded and ready for attachment to the deployment system 150 .
- the tissue punch 100 includes a piercing element 102 positioned within the trocar 152 .
- the piercing element 102 can be retracted in the trocar 152 by an elongated member 104 , such as a spring steel strap or cable which extends through an opening 153 in a side of the trocar 152 .
- the piercing element 102 includes a pointed distal tip 106 for penetrating the target vessel wall 32 and a narrow shaft portion 108 around which the tissue of the target vessel wall 32 contracts after piercing.
- the deployment system of the present invention further includes a mechanical stop 159 which is preferably compliant in nature in that it may be spring loaded and which will abut the outer wall surface of the aorta during the anastomosis procedure.
- the spring loading on the stop 159 is preferably in the range of approximately 0.5 to 3.0 pounds.
- the mechanical stop has been located against the wall of the aorta and will be locked in said position by the cam rotation to function as a reference point for locating the outer wall of the aorta during further operation of the deployment tool 150 .
- FIGS. 6-6A illustrate the tissue punch 100 attached to the deployment tool 150 .
- the deployment tool 150 preferably includes a cam body 189 having four contoured cam slots 178 , 180 , 182 , 183 corresponding to the trocar 152 , holder tube 154 , expander tube 156 , and a retraction release mechanism for the tissue punch 100 , respectively.
- Each of the tubes has a fitting 184 at a distal end thereof.
- An engagement member or pin 186 connected to each of the fittings 184 slides in a corresponding one of the cam slots 178 , 180 , 182 , 183 .
- the cam grooves 178 ′, 180 ′, 182 ′, 183 ′ may be formed in one or more rotatable cylinders 190 and engagement members 186 ′ are provided for engagement within the grooves.
- a spring 196 ′ is provided which, upon release during the initial rotation of the knob 160 ′, results in firing of the piercing element 102 of the tissue punch 100 ′.
- a further spring 104 ′ is provided for retraction of the tissue punch upon the release thereof during subsequent rotation of the control member 160 ′, as discussed further below with respect to the first embodiment of the invention.
- the engagement members slide in the respective cam slots or grooves to cause corresponding rotation of the cams and to cause actuation and retraction of the tissue punch and to move the trocar, holder tube and expander tube to the successive positions illustrated in FIGS. 5-17, and deploy the anastomosis device, as explained in detail below with respect to the first embodiment of the invention.
- a gear box may also be utilized to obtain the desired correspondence between rotation of the control member and the corresponding rotation of the cams.
- a trigger pin 194 is engaged with a collar 192 of the tissue punch 100 so as to prevent the inadvertent firing of the piercing element prior to release.
- a spring 196 is also shown in its compressed state awaiting release of the trigger pin 194 .
- the trigger pin 194 releases the collar 192 and the compressed spring 196 .
- the piercing element 102 of the tissue punch 100 is thus advanced by the spring actuation into the wall of the target vessel 32 , as shown in the enlarged view of FIG. 7A, while the trocar 152 remains within the housing 158 . After piercing, the tissue of the target vessel wall rests around the shaft portion 108 of the piercing element 102 .
- the knob 160 has been further rotated as evidenced by the further rotated position of the cams 178 , 180 , 182 , 183 , and the trocar 152 and tissue punch sheath 162 have been advanced through the target vessel wall to thereby capture the piercing element 102 within the sheath 162 and punch the required opening 34 in the target vessel 32 .
- the tissue surrounding the shaft 108 is severed from the vessel wall and trapped within the sheath 162 for excision.
- the pin 186 is disposed at the terminal edge of cam slot 183 , just prior to release of the tissue retraction mechanism 198 .
- FIGS. 9-11A illustrate the retraction of the tissue punch 100 upon successive rotation of the knob 160 and the corresponding rotation of the cams following the release of pin 186 from cam slot 183 .
- the retraction spring 104 has been actuated and the piercing element 102 is withdrawn such that it bottoms on a rear surface 164 of the sheath 162 .
- Further retraction of the tissue punch 100 causes the tissue punch to rotate out of the opening 153 in the trocar 152 .
- the tissue punch 100 continues to rotate to a storage position outside of the trocar 152 within the housing 158 .
- the lumen within the trocar 152 can be used to maintain the opening 34 within the blood vessel and for delivery of the anastomosis device to the puncture site in the target vessel.
- the cams have been further rotated. Moreover, the holder tube 154 has advanced to within the target vessel with the anastomosis device 600 attached thereto.
- the expander tube 156 is immediately behind the holder tube 154 prior to deployment of the anastomosis device 600 , while the trocar 152 has further withdrawn within through the opening 34 .
- the anastomosis device 600 is now in position for deployment.
- the holder tube is advanced significantly past, approximately 0.2 inch for example, a position which would be required for the thickest possible aortic wall such that the surgeon can be certain that the anastomosis device is within the lumen of the target vessel and the inner flange will thus be deployed intramurally, as described below.
- FIGS. 14-14A show the cams further rotated by the knob 160 and the cam slot 182 has caused the expander tube 156 to be advanced through the holder tube 154 to thereby deploy the inner flange 20 of the anastomosis device.
- an expander tube is preferable for causing the deployment of the inner flange, it is within the scope of the present invention to use other mechanisms for causing the deployment thereof.
- the trocar 152 has also been further withdrawn from the puncture site.
- FIGS. 15-15A show that further rotation of the knob 160 causes the further pivoting of the cams 178 , 180 , 182 .
- the holder tube 154 and the expander tube 156 have been slightly withdrawn to pull the inner flange of the anastomosis device 600 against the vessel wall 32 .
- the trocar 152 is also now completely withdrawn into the housing 158 . Because of the variation in the thickness of the aortic wall among patients, the retraction of the inner flange is overshot beyond that which would be required for the thinnest possible aortic wall. In so doing, the present invention ensures that the inner flange will be in firm contact with the inner surface of the aortic wall.
- the mechanical stop 159 is released from its locked reference point during seating of the inner flange, and the compliant nature thereof allows the stop 159 to thus function as a counter-force against the withdrawal of the holder tube and expander tube and the retraction of the inner flange.
- An alternative embodiment to the mechanical stop may not be spring loaded, but rather, may include a larger outer diameter on the distal end thereof. As such, the mechanical stop will cause the surrounding tissue to stretch and thus provide a certain degree of resiliency which can adequately counteract the withdrawal force during the seating of the inner flange.
- the cams have been further pivoted due to the successive rotation of the knob 160 , and in so doing the holder tube 154 has moved forward again to deploy the outer flange 22 of the anastomosis device through compression of the linkages, and disengage the holder tube 154 from the anastomosis device 600 .
- the inner and outer radial flanges 20 , 22 trap the wall of the target vessel 32 between the flanges and thus secure the everted graft vessel 30 to the target vessel.
- the mechanical stop 159 abuts the outer wall surface of the aorta during the deployment of the outer flange and prevents the unseating of the inner flange.
- the trocars and anastomosis devices described above can be single piece or multi-piece devices which are formed by laser cutting or punching from a tube or sheet of material.
- the devices may be provided in varying sizes to join vessels of different sizes.
- the trocar and/or anastomosis devices of the present invention may be used in other types of anastomosis procedures.
- the trocar and/or anastomosis device may be used in femoral-femoral bypass, vascular shunts, subclavian-carotid bypass, organ transplants, and the like.
- the trocar and/or anastomosis devices may be made of any known material which can be elastically or plastically deformed such as stainless steel, nickel titanium alloys, polymer materials, and the like.
Abstract
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US09/709,373 US6471713B1 (en) | 2000-11-13 | 2000-11-13 | System for deploying an anastomosis device and method of performing anastomosis |
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Cited By (34)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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